What is this even in reference to?
DHH's post "As I Remember London" which I inferred from this post referring to Omarchy as "fashtech" and based on other recent posts about the same thing.
fear and hatred of strangers or foreigners
I don't see any fear or hatred of strangers or foreigners in the referenced post. I don't want to explicitly link it in case that would anger the mods somehow, but it is easy to find.
You may criticize his nationalism, immigration views, or rhetoric as exclusionary or ethnonationalist. But IMO calling him fascist requires showing more than concern about demographic change.
Is he using “gypsy” to refer to illegal immigrants?
I don't know, you would have to ask him. I was just pointing out that it's not objectively obvious as to their intent and I don't think people are reacting fairly, rationally or even attempting to use critical thinking.
Unfortunately social media amplifies outrage because it generates clicks, and attempting to have calm and reasonable discussions is often simply downvoted and ignored.
In this way I find that tech-central sites with active commentary like reddit/lemmy/phoronix/etc. are quite often just as cancerous as Facebook and such. You would think a lot more technical people would be more rational but I haven't found that to be the case the majority of the time.